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===Understanding iptables===
iptables is a <u>very complex</u> topic. Fortunately, you are not required to become an "iptables expert", but by the end of the course, you should be able to use iptables to properly secure your servers.
Some documentation to get started with (you'll need to find more):
* [https://wiki.centos.org/HowTos/Network/IPTables CentOS Wiki] Listing of basic commands (not all required to know).
[[Image:iptables.png]]
